US4355558A - Shears for sheet metal cutting - Google Patents

Shears for sheet metal cutting Download PDF

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Publication number
US4355558A
US4355558A US06/158,637 US15863780A US4355558A US 4355558 A US4355558 A US 4355558A US 15863780 A US15863780 A US 15863780A US 4355558 A US4355558 A US 4355558A
Authority
US
United States
Prior art keywords
shearing
stand
blade
shaft
drive mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/158,637
Other languages
English (en)
Inventor
Leo Hofer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NORDTOOL AB
Original Assignee
NORDTOOL AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NORDTOOL AB filed Critical NORDTOOL AB
Application granted granted Critical
Publication of US4355558A publication Critical patent/US4355558A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8776—Constantly urged tool or tool support [e.g., spring biased]
    • Y10T83/8782—Stored energy furnishes cutting force
    • Y10T83/8784—With reset
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8788—Tool return mechanism separate from tool advance mechanism
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8821—With simple rectilinear reciprocating motion only
    • Y10T83/8841—Tool driver movable relative to tool support
    • Y10T83/8843—Cam or eccentric revolving about fixed axis

Definitions

  • This invention relates to a pair of shears for cutting sheet metal, comprising a frame with a shear blade rigidly attached thereto and a shear blade movable relative thereto, and a drive mechanism for said movable shear blade.
  • Power shears as known are used for shearing sheet metal and/or cutting to size sheet metal details with straight edges. For such shearing and cutting operations relatively great forces are required which cannot be brought about manually except by using gear mechanisms.
  • Known power shears therefore, normally are driven hydraulically or electrically.
  • the object of the present invention is to produce a shears for sheet metal shearing which can be operated manually for shearing sheet metal with a thickness of up to at least 2-3 mm.
  • This object is achieved in principle in that the greater part of the dead weight of the shears is utilized for the shearing operation and thereby to a corresponding degree reduces the force to be supplied from outside.
  • Said object is achieved in that the shears according to the invention have been given the characterizing features defined in the attached claims.
  • FIG. 1 is a front view, partially in section, of a manually operated embodiment of the present shears
  • FIG. 2 is a section on a larger scale along substantially the line II--II in FIG. 1, and
  • FIG. 3 is a section along the line III--III in FIG. 1.
  • the embodiment of the present shears for manual operation shown only by way of example in the drawing is built up on a plate 1 serving as a stand.
  • the plate is shown so designed that it can be positioned in a slit 2 in a work-table 3 and be rigidly attached thereto, as indicated schematically in FIG. 2.
  • an angle-bracket 5 is detachably mounted by screws 4, and one blade 6 of the shears in the form of a stationary, horizontal lower blade is attached exchangeably to said bracket by screws 7.
  • runners 10 are suspended in spaced relationship by means of holders 9 fastened in grooves 8 in the plate, which runners co-act each with a lift-plate 11, or more exactly, with a run surface 12 formed inwardly in each lift-plate 11 and designed as an eccentric lift-curve.
  • Said lift-plates 11 are mounted rigidly on the drive shaft 13 of the shears, which in the starting position of the shears shown in FIGS. 1 and 2 is supported by the runners 10 via the lift-plates 11.
  • the drive shaft 13 is supported in two vertical guide columns 15 by means of bearings 14, for example needle bearings.
  • the columns include between themselves the lower blade 6 and extend through holes 16 in the stand plate 1, above which the columns are interconnected by a cross-piece 17, which like the drive shaft 13 is in parallel with the stand plate 1.
  • the cross-piece 17 is retained by means of locking nuts 18 located on pegs 19, which are formed at the end of each guide column and extend through holes 20 in the cross-piece 17, which rests against a shoulder 21 on each guide column.
  • the second blade 22 on the shears is attached exchangeably by screws 23 on an angle-bracket 24 between the columns 15, which bracket in its turn is connected detachably to the lower surface of the cross-piece by screws 25.
  • Said second blade 22 on the shears at the embodiment shown is inclined relative to the stationary lower blade 6 of the shears, whereby sheet metal inserted between the blades is cut successively from one edge to the other, whereby as a result the necessary shearing forces are distributed uniformly.
  • Each guide-column 15 is guided by a ball-guide 26 and for vertical movement supported in a bushing 27, which is provided in the hole 16 in the stand-plate 1 and connected to said plate.
  • a lower distance sleeve 28 is located beneath the stand-plate 1, and an upper distance sleeve 29 is located between the cross-piece 17, which can be lifted and lowered relative to the stand-plate 1, and the bushing 27.
  • the distance between the ends of the bushing and of the upper distance sleeve facing toward each other shall be at least equal to the distance, through which the movable upper blade 22 must be movable for cutting off a sheet with a width corresponding at least to the length of the blade.
  • the guide-columns are vertically movable relative to the stand plate 1. Due to the fact, that both the upper piece 17 with associated angle-bracket 24 and blade 22 and the drive shaft 13 are connected to the guide-columns 15, a substantial downward force is obtained by the dead weight of these members, which force tends to draw the upper blade down and thereby, according to the principles constituting the basis of the invention, can be utilized as shearing force. Consequently, the force to be supplied from outside for carying out a shearing operation, can be reduced to a corresponding degree. Thereby the present shears also suitably can be operated manually, but of course they also may be power-driven.
  • a control lever 30 (FIG. 3) preferably provided with a detachable extension pipe 31 is connected to the drive shaft 13 via a holder 32 non-rotatably connected to said shaft for manually driving the same.
  • the shaft is provided with two eccentrics 33, which co-operate each with a counter-hold screw 34 located adjustably at the lower surface of the stand-plate, in order upon rotation of the drive shaft 13 in the direction indicated by arrow 35 in FIG. 2 to press the drive shaft 13 downward, whereby via the guide columns 15 also the upper blade 22 is drawn in downward direction for cutting off a sheet located between the blades 6 and 22.
  • the counter-hold screws 34 are lockable in every set height position by locking nuts 36, and their vertical longitudinal axis 37 is slightly offset laterally relative to a vertical plane 38 through the rotation centre 39 of the drive shaft, as shown in FIG. 2. In said vertical plane, also the shearing or cutting cut takes place.
  • the drive shaft 13 in this position is prevented in one way or another to rotate relative to the end of the guide-columns, which end is formed as a bearing housing 45 for the bearings 14.
  • this is brought about by means of a so-called spring-lock 40, which consists of a locking ball 42 spring-loaded in a screw 41 and by its spring held with a pressure, which is adapted to said downward force, in an impression in one side of the bearing housing.
  • Said screw 14 is screwn into a plate 44, which is connected non-rotatably to the drive shaft 13, and which on both sides and in a plane through the rotation centre 39 of the shaft supports two set screws 46 for limiting the rotation of the drive shaft in co-operation with a peg 47 attached to the bearing housing.
  • Said limitation of the maximum rotation of the drive shaft can be effected in many other ways, for example by means of the distance sleeves 28, 29.
  • the angle, through which the drive shaft 13 must be rotatable in order to cause the upper blade 22 to co-act with the lower blade 6 along its entire length, is determined by the pitch or eccentricity of the eccentrics. At the embodiment shown, said angle is slightly above 90°, i.e. the drive shaft 13 must be rotated through at least 90° for causing the upper blade 22 to be lowered beneath the lower blade 6 along its entire length.
  • the run surfaces 12 of the lift-plates have the same eccentricity as the eccentrics 33, and their object is upon rotation of the drive shaft in the direction opposed to the direction indicated by arrow 35 to return the upper blade 22 to the starting position shown in FIGS.
  • the upper blade 22 is caused to move downward and, thus, successively shears or cuts off the sheet.
  • the drive mechanism is moved downward by action of gravity, but is caught by the runners 10, which by co-operation with the eccentric cam curve 12 of the lift-plates on the drive shaft 13 lifts the drive mechanism up to the starting position shown in FIGS. 1 and 2 when the drive shaft 13 is turned in the direction opposed to that shown in FIG. 2.
  • the present invention is not restricted to the embodiment described above and shown in the drawings, but can be altered, completed and modified in many different ways within the scope of the invention idea defined in the claims.
  • the present shears for example, can be adapted to motor operation, in which case, for example, a piston-cylinder means, preferably double-acting, turns the drive shaft.
  • the shears also may be equipped with blades other than those shown, which are intended for shearing corrugated sheet metal, for example with straight blades.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
  • Scissors And Nippers (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Sawing (AREA)
US06/158,637 1979-06-21 1980-06-11 Shears for sheet metal cutting Expired - Lifetime US4355558A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7905344 1979-06-21
SE7905344A SE417681B (sv) 1979-06-21 1979-06-21 Sax for platklippning

Publications (1)

Publication Number Publication Date
US4355558A true US4355558A (en) 1982-10-26

Family

ID=20338313

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/158,637 Expired - Lifetime US4355558A (en) 1979-06-21 1980-06-11 Shears for sheet metal cutting

Country Status (8)

Country Link
US (1) US4355558A (de)
JP (1) JPS5639812A (de)
DE (1) DE3022922A1 (de)
DK (1) DK261280A (de)
FI (1) FI67798C (de)
GB (1) GB2053066B (de)
NO (1) NO148911C (de)
SE (1) SE417681B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901627A (en) * 1996-08-13 1999-05-11 Littell International, Inc. Apparatus and method for shearing material
CN109940211A (zh) * 2019-05-05 2019-06-28 江阴职业技术学院 一种小方块专用剪切装置
CN114474615A (zh) * 2022-02-10 2022-05-13 广东若铂智能机器人有限公司 一种单轴机器人中间剪断及翻转取料装置及其方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6049049A (ja) * 1983-08-30 1985-03-18 Mitsubishi Petrochem Co Ltd ポリプロピレン組成物
GB8525157D0 (en) * 1985-10-11 1985-11-13 Keeton Sons Shears
CN107053319A (zh) * 2017-06-08 2017-08-18 玖德隆机械（昆山）有限公司 计量式橡塑板材剪板机

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US58778A (en) * 1866-10-16 Improvement in straw-cutters
US115493A (en) * 1871-05-30 Improvement in machines for piercing side seams of boots
US304829A (en) * 1884-09-09 Metal-shearing machine
US344074A (en) * 1886-06-22 Device
US540013A (en) * 1895-05-28 alexander
US592564A (en) * 1897-10-26 Machine for perforating paper
US655267A (en) * 1900-02-03 1900-08-07 Alexander Obermeyer Machine-tool for punching, stamping, &c.
US763804A (en) * 1903-04-15 1904-06-28 Frank A Seiberling Fabric-cutting machine.
US836700A (en) * 1905-10-13 1906-11-27 Franz Georg Oldenburg Punching-machine.
US1722819A (en) * 1924-02-04 1929-07-30 Niagara Machine And Tool Works Holddown mechanism for shearing machines
FR1462059A (fr) * 1965-01-11 1966-12-09 United Eng Foundry Co Cisaille volante

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206274B (de) * 1952-10-02 1965-12-02 Scharringhausen Maschb Ges M B Tafelschere mit unterhalb des festen Messertisches liegendem Kurbelantrieb fuer den beweglichen Messerbalken
US3033055A (en) * 1957-07-26 1962-05-08 Trumpf & Co Adjustable eccentric
GB1305014A (de) * 1969-03-10 1973-01-31

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US58778A (en) * 1866-10-16 Improvement in straw-cutters
US115493A (en) * 1871-05-30 Improvement in machines for piercing side seams of boots
US304829A (en) * 1884-09-09 Metal-shearing machine
US344074A (en) * 1886-06-22 Device
US540013A (en) * 1895-05-28 alexander
US592564A (en) * 1897-10-26 Machine for perforating paper
US655267A (en) * 1900-02-03 1900-08-07 Alexander Obermeyer Machine-tool for punching, stamping, &c.
US763804A (en) * 1903-04-15 1904-06-28 Frank A Seiberling Fabric-cutting machine.
US836700A (en) * 1905-10-13 1906-11-27 Franz Georg Oldenburg Punching-machine.
US1722819A (en) * 1924-02-04 1929-07-30 Niagara Machine And Tool Works Holddown mechanism for shearing machines
FR1462059A (fr) * 1965-01-11 1966-12-09 United Eng Foundry Co Cisaille volante

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901627A (en) * 1996-08-13 1999-05-11 Littell International, Inc. Apparatus and method for shearing material
CN109940211A (zh) * 2019-05-05 2019-06-28 江阴职业技术学院 一种小方块专用剪切装置
CN109940211B (zh) * 2019-05-05 2024-02-23 江阴职业技术学院 一种小方块专用剪切装置
CN114474615A (zh) * 2022-02-10 2022-05-13 广东若铂智能机器人有限公司 一种单轴机器人中间剪断及翻转取料装置及其方法
CN114474615B (zh) * 2022-02-10 2023-07-25 广东若铂智能机器人有限公司 一种单轴机器人中间剪断及翻转取料装置及其方法

Also Published As

Publication number Publication date
FI67798B (fi) 1985-02-28
NO801839L (no) 1980-12-22
NO148911B (no) 1983-10-03
DE3022922A1 (de) 1981-01-29
FI801909A (fi) 1980-12-22
FI67798C (fi) 1985-06-10
GB2053066B (en) 1984-05-16
GB2053066A (en) 1981-02-04
NO148911C (no) 1984-01-11
DK261280A (da) 1980-12-22
SE417681B (sv) 1981-04-06
SE7905344L (sv) 1980-12-22
JPS5639812A (en) 1981-04-15

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